Heads up: No more snap plugin in gnome-software

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Hi all,

In Fedora 31 I'll be disabling the snap plugin from GNOME Software.
It's never been enabled in RHEL and so this change only affects
Fedora. It's also not installed by default and so this change should
only affect a few people. It's also not really a FutureFeature, it's a
RemovalOfFeature but I'm happy to write something for the process and
release notes if required.

Recently Canonical decided that they are not going to be installing
gnome-software in the next LTS, preferring instead to ship a "Snap
Store by Canonical" rather than GNOME Software. The new Snap store
will obviously not support Flatpaks (or packages, or even firmware
updates for that matter). The developers currently assigned to work on
gnome-software have been reassigned to work on Snap Store, and I'm not
confident they'll be able to keep both the old and new codebases in
the air at the same time.

As you might know, enabling the snap plugin also enables the "Snap
Store" which seemingly violates the same rules which prevent us
installing Flathub by default (enabling access to nonfree software,
and software with patent restrictions). Without the Snap Store the
snap support is pretty useless, as snapd is so tied to the snapcraft
ecosystem, and because you can't actually run your own instance of the
snap store, unlike Flatpak.

The existing snap plugin is not very well tested and I don't want to
be the one responsible when it breaks. At the moment enabling the snap
plugin causes the general UX of gnome-software to degrade, as all
search queries are also routed through snapd rather than being handled
in the same process. The design of snapd also means that packages just
get updated behind gnome-software's back, and so it's very hard to do
anything useful in the UI, or to make things like metered data work
correctly. There's also still no sandboxing support years after it was
promised, which means on Fedora running a snap is no more secure than
"wget -O - URL | bash", again much unlike Flatpak.

I appreciate this is going to be controversial, and that some people
want snap support turned back on in GNOME Software. My answer there
would be that I'm perfectly happy with someone creating a new
gnome-software-snap top-level package (plugins in gnome-software are
just runtime loaded .so objects, rather than all compiled together)
and then they're responsible for keeping it up to date with any plugin
ABI breaks in gnome-software upstream (usually once per GNOME cycle)
and for any API or behaviour changes in snapd-glib. Basically, as long
as it's not my email that gets pinged by bugzilla when it breaks it's
fine. There was some suggestion that upstream we'd remove the snap
plugin completely, but I think it will remain until we see if snap
support improves or deteriorates further.

Comments welcome, but anyone who insults me or insists I do more work
than I'm doing now will be ignored.

Richard.
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